Activity 16: Elements and the Periodic Table Warm up: what are the 4 families on the periodic table? Try to go in order. Name a characteristic of each family you listed.

First Quarter Feedback Form You do not have to write your name on it. Please be honest and fair. Do not be concerned with what your neighbor is putting. You are your own person! When finished, place in gray “turn in” bin.

Activity 15 Analysis Questions Reminder: the UC assessment was due today! The last day I will accept any late work from Activity 12- Activity 15 is Wednesday.

Activity 15 In Case You Missed It... Elements can be organized into families based on their properties, such as reactivity or atomic mass. Atom- building block of matter Atomic mass- mass of one atom in an element. – Unit: atomic mass unit (amu) – Example: Carbon’s atomic mass is amu

Activity 15 In Case You Missed It... The periodic table is categorized into 4 families, which are columns. Alkali metals, alkaline earth metals, halogens, and noble gases. All members of the family have the same reactivity and bonds to hydrogen.

Activity 15 In Case You Missed It... Atomic mass increases as you move down a family. Less atomic mass More atomic mass

Activity 16: Elements and the Periodic Table Of the four families we investigated, which 2 seemed most alike? Was there a family that was most different from the others? What kinds of properties can you use to distinguish groups of elements?

Activity 16: Elements and the Periodic Table Please open your books to page B22.

Activity 16: Elements and the Periodic Table Jigsaw Reading: – Each group will be assigned a section(s) of the text to read. – Read it silently first, then discuss with your group what you think the 2-3 most important things are. – Come up with a way to effectively teach this to the class. Be creative AND effective/engaging! – Each group will teach section to the class. – Be sure to address the “Stopping to Think” questions!

Jigsaw Reading Instructions Read the section assigned to you silently. Discuss it with your group to decide the most important parts. Teaching the class: – State the most important parts – Read the “Stopping to Think” questions and answers – Use diagrams or pictures – Be prepared to answer questions!

Jigsaw Notes Discovering Elements –1600s, scientists realized that all things are made of elements (found in nature) – known elements

Jigsaw Notes Mendeleev and the Periodic Table of the Elements –Mendeleev- Russian scientist; developed periodic table by building off of other scientists’ research. –Different elements fit into different groups according to reactivity and atomic mass, but there were gaps. Other scientists filled in those gaps to complete the periodic table

Jigsaw Notes Modern Periodic Table –Over 100 elements today. –Can tell element’s reactivity, what state it is in, what family it is in. –Metalloids- have physical and chemical properties of both metals and nonmetal. Located on the line that separates metals and nonmetals Not hard metals, semi-conductors –Can predict reactivity of an element based on the location on the periodic table. More reactive on the left, less reactive on the right, except halogens

Jigsaw Notes Forming Compounds –Compounds- can be broken into individual elements but elements cannot –Molecule- smallest form of a compound H 2 O –Molecule has its own properties that are different than the elements that it makes up

Jigsaw Notes Chemical Names and Formulas –Short way to identify compound elements is a chemical formula, which the abbreviation of the elements together. –If there is more than one atom of the same element, it has a notation next to it. NaHCO 3 Classifying Matter –Everything is an element, compound, or a mixture. –Element- copper, aluminum –Compounds- salt and sugar –Mixture- not a pure element or compound (air)

Chemical Compounds Matt 5:13 “You are the ____ of the earth,” made of sodium and chlorine: Dry ice is a solid form of this compound: Table sugar has 12 carbons, 22 hydrogens, and 11 oxygens. What is the compound?

Tonight’s Homework Complete Activity 16 analysis questions before our next class. Remember that any late work/make-up labs need to be completed before Wednesday at 7:55 am!